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THE RESPONSE TO QUESTIONNAIRE-CONTROL OF PAVEMENT MOVEMENTS ADJACENT TO STRUCTURES

THE MISSISSIPPI STATE HIGHWAY DEPARTMENT, AWARE OF DAMAGE TO STRUCTURES CAUSED BY EXCESSIVE PRESSURES ASSOCIATED WITH THE TENDENCY OF THE ENDS OF RIGID PAVEMENTS TO UNDERGO PROGRESSIVE OUTWARD MOVEMENTS, INITIATED A STUDY TO DETERMINE THE BEST METHODS OR DEVICES TO CONTROL THESE UNDESIRABLE MOVEMENTS. A QUESTIONNAIRE WAS SENT TO ALL STATE HIGHWAY DEPARTMENTS REQUESTING INFORMATION ON EXPERIENCE WITH THE PROBLEM OF PAVEMENT ENCROACHMENT ON STRUCTURES. A SUMMARY ANALYSIS IS PRESENTED OF THE RESPONSE TO THE QUESTIONNAIRE. THE FOLLOWING TWO MAJOR QUESTIONS WERE POSED' 1/ HOW PREVALENT IS DAMAGE TO STRUCTURES FROM MOVEMENT OF RIGID PAVEMENTS IN YOUR STATE{, 2/ WHAT ACTION HAS BEEN TAKEN OR CONSIDERED TO CONTROL, PREVENT OR REPAIR DAMAGES TO STRUCTURES FROM PAVEMENT MOVEMENT{ A SUMMARY OF THE REPLIES TO THE QUESTIONNAIRE SHOWED THAT DAMAGE TO STRUCTURES IS VERY PREVELANT IN 5 STATES, PREVELANT IN 6, OCCASSIONAL IN 13, RARE IN 7 & NONEXISTENT IN 15. OF THIS LATTER GROUP, 11 HIGHWAY DEPARTMENTS REPORTED VERY FEW RIGID PAVEMENTS IN THEIR STATES. PROMINENT AMONG THE FACTORS MENTIONED AS CONTRIBUTING TO THE PROBLEM WERE EXPANSIVE AGGREGATE, ALKALI-AGGREGATE REACTION, INFILTRATED SOLIDS IN TRANSVERSE JOINTS, AND DOWNHILL CREEP OF PAVEMENT. THE MOST POPULAR METHOD OF DEALING WITH THE PROBLEM IS RELIEF BY CUTTING OUT A STRIP OF PAVEMENT NEAR THE BRIDGE ENDS AND FILLING THE GAP WITH COMPRESSIBLE MATERIAL. TEN STATES USED SOME FORM OF END ANCHORAGE TO RESTRAIN PAVEMENT MOVEMENT, PARTICULARLY IN CONJUNCTION WITH CONTINUOUSLY REINFORCED PAVEMENT. SEVERAL STATES REPORTED SATISFACTORY RESULTS WITH A SERIES OF DOWELED 1-INCH EXPANSION JOINTS.